It's fine. Ur breast size has nothing to do with how much milk u have. In have a cousin A cup breast's never grew in all 5 pregnancies, 1 with twins & she had plenty of milk. My 1st pregnancy I began at A cup & grew quickly to a DD. This time around I started at A cup again got to a C & slowed down,now at 13 weeks. By the end I'm sure they'll grow more.
Book size and growth doesn't have a correlation to milk production my boobs haven't grown at all either and I'm still starting to leak at 16weeks
I have small boobs so I was worried.
It doesn't matter the size. Mine only got slightly bigger at the end of my 3rd pregnancy. Best of luck with breastfeeding it comes easy to some, but difficult for others.
My boobs started to grow from around 4th week. I'm 14 was now and the seem to have slowed. I've more than doubled in size but had less than a handful to begin with. I don't think the size has much to do with milk production. All women seem to have changes at different times, so best ask your doctor.
I think thats normal mines didnt blow up till after labor and even then baby had a bit of struggle latching on im now pregnant with my 2nd n my boobs are the same...but they were very sore in my first trimester.